<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

  <style>
    div{
      color: red;
    }
    p{
      color: blue !important
    }
    #p2{
      color: green;
    }

  </style>

</head>
<body>
<P>P1</P>
<div>
  div
  <p id="p2">p2</p>
  <span>span</span>
  <a href="">超链接</a>
</div>
</body>
</html>